538 
103. CHARACE.E. 
lax, nucules 2 or 3 together with 8 or 9 spires. — Atl. Ft. Par. 
40. — Usually slender, flexible, light green, often [annularly] 
incrUSted. — crd^sa (Braun); st. and branchl. stouter, end-segmen; s 
shorter. 7. nidijica (Wallm.); fertile branchl. very short, formins compact 
heads, sterile branchl. often simple.] — Ponds. VI. VII. E. 
2. 3'. opdca (Ag.) ; dioecious, st. slender flexible transparent, 
branchlets mucronate, fertile whorls usually dense, nucules 1 — 
3 together naked with 6 blunt prominent spires J. of B. xviii. 
t. 210. — Eather slender, turning nearly black. W^iorls with 
nucules dense, with globules usually more lax. attenuata (H. 
& J. G.); branchlets longer and much more slender, fertile whorls lax.] — Pouds 
and ditches. A. V. VI. E. S. 1. 
3. y.rapitdta (Ag.); dicecious,st. slender flexible transparent, 
branchlets mucronate, fertile whorls usually dense, nucules 
with acute prominent spires and a mucilaginous coatiny. — 
Slender, yellowish brown. Globules large. Often annularly 
incrusted.— Cambs. ./. of B. xxiv. (1886) p. 1, t. 264. A. E. 
[li. syncar'pa (Chevall.) : more slender than N. oj>aca with 
simple branchlets on the female plant, and nucules with a 
mucilaginous coating and faintly marked spires ; is probably a 
native.'] 
tf Branchlets repeatedly divided ; terminal segments of 2 
or more cells, last usually like a mucro. — Monoecious. 
4. N. transldcens (Ag.) ; st. thick equal flexible transparent, 
last segments of branchlets of 2 or 3 cells, sterile branchlets 
only once divided (at the end) into 2 — 4 'minute rays, nucules 
small usually in threes with 7 or 8 spires. — E. B. 1851. — A 
very large plant. Sterile branchlets appear simple ; the rays 
resemble minute points at their end. — Deep water. A. VIII. 
E. S. T. 
5. N. mucromita (Miquel) ; st. equal flexible transparent, 
branchlets nearly e<}ually forked or trifid tipped u'ith a minute 
acutely conical cell, 7mcules and glohides together at the forkings 
of the branchlets. — Atl. Fl. Par. 40. — Rather thick. Dark 
green. Secondary rays once or twice forked, terminal sub- 
divisions rather shorter than the others. Nucules with 7 or 8 
spires. — Rivers and ditches, rare. A. VII. E. I. 
6. N. grac'ilis (Ag.) ; st. equal flexible transparent, slender 
bi-anchlets in lax whorls twice or thrice nearly equally forked, 
1 We have at present no eTtdence in support of this ; though from its distribu- 
tion the sp. is likely to occur. — H. & J. G. 
